Mitsubishi Montero Sport (2004+). Manual — part 147
13A-1
GROUP 13A
MULTIPORT FUEL
INJECTION (MFI)
CONTENTS
GENERAL DESCRIPTION. . . . . . . . .
MULTIPORT FUEL INJECTION (MFI)
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING STRATEGY . . . . . .
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
FAIL-SAFE/BACKUP FUNCTION TABLE .
DIAGNOSTIC TROUBLE CODE CHART . .
SYMPTOM CHART. . . . . . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE
PROCEDURES. . . . . . . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
ACTUATOR TEST REFERENCE TABLE. .
CHECK AT PCM TERMINAL . . . . . . . . . . .
CHECK PROCEDURE WITH
OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
COMPONENT LOCATION . . . . . . . . . . . . .
THROTTLE BODY CLEANING. . . . . . . . . .
THROTTLE POSITION SENSOR
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . .
BASIC IDLE SPEED ADJUSTMENT . . . . .
FUEL PRESSURE TEST . . . . . . . . . . . . . .
FUEL PUMP CONNECTOR
DISCONNECTION (HOW TO REDUCE
PRESSURIZED FUEL LINES) . . . . . . . . . .
FUEL PUMP OPERATION CHECK . . . . . .
MULTIPORT FUEL INJECTION RELAY
AND FUEL RELAY CHECK . . . . . . . . . . . .
INTAKE AIR TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE COOLANT TEMPERATURE
SENSOR CHECK . . . . . . . . . . . . . . . . . . . .
THROTTLE POSITION SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HEATED OXYGEN SENSOR CHECK . . . .
INJECTOR CHECK . . . . . . . . . . . . . . . . . . .
IDLE AIR CONTROL MOTOR CHECK . . . .
EVAPORATIVE EMISSION PURGE
SOLENOID CHECK . . . . . . . . . . . . . . . . . .
EGR SOLENOID CHECK . . . . . . . . . . . . . .
INJECTOR . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
THROTTLE BODY ASSEMBLY . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . .
GENERAL SPECIFICATION(S) . . . . . . . . .
SERVICE SPECIFICATION(S) . . . . . . . . . .
SEALANT AND ADHESIVE . . . . . . . . . . . .
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-2
GENERAL DESCRIPTION
M1131000100994
.
The Multiport Fuel Injection System consists of sen-
sors which detect the engine conditions, the POW-
ERTRAIN CONTROL MODULE (PCM) which
controls the system based on signals from these
sensors, and actuators which operate under the con-
trol of the PCM.
The PCM carries out activities such as fuel injection
control, idle air control, and ignition timing control.
In addition, the PCM is equipped with several diag-
nostic test modes which simplify troubleshooting
when a problem develops.
.
FUEL INJECTION CONTROL
The injector drive times and Injection timing are con-
trolled so that the optimum air/fuel mixture is sup-
plied to the engine to correspond to the
continually-changing engine operation conditions.
A single injector is mounted at the intake port of each
cylinder. Fuel is sent under pressure from the fuel
tank to the fuel injectors by the fuel pump, with the
pressure being regulated by the fuel pressure regula-
tor. The regulated fuel is distributed to each of the
injectors.
Fuel injection is normally carried out once for each
cylinder for every two rotations of the crankshaft. The
firing order is 1-2-3-4-5-6. Each cylinder has a dedi-
cated fuel injector. This is called multiport.
The PCM provides a richer air/fuel mixture by carry-
ing out "open-loop" control when the engine is cold
or operating under high load conditions in order to
maintain engine performance.In addition, when the
engine is under normal operating temperature after
warming-up, the PCM controls the air/fuel mixture by
using the heated oxygen sensor signal to carry out
"closed-loop" control. The closed-loop control
achieves the theoretical air/fuel mixture ratio where
the catalytic converter can obtains the maximum
cleaning performance.
.
IDLE AIR CONTROL
The idle speed is kept at the optimum speed by con-
trolling the amount of air that bypasses the throttle
valve in accordance with changes in idling conditions
and engine load during idling.
The PCM drives the idle air control (IAC) motor to
keep the engine running at the pre-set idle target
speed in accordance with the engine coolant temper-
ature and A/C and other electrical load. In addition,
when the A/C switch is turned off and on while the
engine is idling, the IAC motor adjusts the throttle
valve bypass air amount according to the engine
load conditions to avoid fluctuations in the engine
speed.
.
IGNITION TIMING CONTROL
The ignition power transistor located in the ignition
primary circuit turns ON and OFF to control the pri-
mary current flow to the ignition coil. This controls the
ignition timing to provide the optimum ignition timing
with respect to the engine operating conditions. The
ignition timing is determined by the PCM from engine
speed, intake air volume, engine coolant tempera-
ture, and atmospheric pressure.
.
DIAGNOSTIC TEST MODE
• When an abnormality is detected in one of the
sensors or actuators related to emission control,
the Malfunction Indicator Lamp (SERVICE
ENGINE SOON or Check Engine Lamp) illumi-
nates to warn the driver.
• When an abnormality is detected in one of the
sensors or actuators, a diagnostic trouble code
corresponding to the abnormality is stored in the
PCM.
• The RAM data inside the PCM that is related to
the sensors and actuators can be read with the
scan tool. In addition, the actuators can be con-
trolled by scan tool MB991958 (MUT-III sub
assembly) under certain circumstances.
.
OTHER CONTROL FUNCTIONS
Fuel Pump Control
• Turns the fuel pump relay ON so that current is
supplied to the fuel pump while the engine is
cranking or running.
A/C Compressor Clutch Relay Control
• Turns the compressor clutch of the A/C ON and
OFF.
Evaporative Emission Purge Control
• (Refer to GROUP 17, Emission Control System −
Evaporative Emission Control System
− General
Description
EGR Control
• (Refer to GROUP 17, Emission Control System −
Exhaust Gas Recirculation (EGR) System - Gen-
eral Description
GENERAL DESCRIPTION
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-3
MULTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM
NOTE: For the vacuum routing, refer to GROUP 17,
Emission Control System
−
Vacuum Hoses
−
Vac-
uum Hose Routing
AK301864
1 LEFT BANK HEATED OXYGEN SENSOR (FRONT)
2 VOLUME AIRFLOW SENSOR
3 INTAKE AIR TEMPERATURE SENSOR
4 THROTTLE POSITION SENSOR
5 CAMSHAFT POSITION SENSOR
6 CRANKSHAFT POSITION SENSOR
7 BAROMETRIC PRESSURE SENSOR
8 ENGINE COOLANT TEMPERATURE SENSOR
9 LEFT BANK HEATED OXYGEN SENSOR (REAR)
10 RIGHT BANK HEATED OXYGEN SENSOR (FRONT)
11 RIGHT BANK HEATED OXYGEN SENSOR (REAR)
12 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
13 MANIFOLD ABSOLUTE PRESSURE SENSOR
14 FUEL TANK TEMPERATURE SENSOR
15 FUEL LEVEL SENSOR
POWER SUPPLY
VEHICLE SPEED SENSOR
A/C SWITCH
TRANSMISSION RANGE SWITCH
POWER STEERING PRESSURE SWITCH
IGNITION SWITCH - ST
KNOCK SENSOR
1 INJECTOR
2 EVAPORATIVE EMISSION
PURGE SOLENOID
3 IDLE AIR CONTROL MOTOR
4 EVAPORATIVE EMISSION
VENTILATION SOLENOID
5 EGR VACUUM REGULATOR
SOLENOID VALVE
FUEL PUMP RELAY
MULTIPORT FUEL INJECTION
(MFI) RELAY
A/C COMPRESSER CLUTCH RELAY
SERVICE ENGINE SOON/
MALFUNCTION INDICATOR LAMP
DIAGNOSTIC OUTPUT
IGNITION COIL,
IGNITION POWER TRANSISTER
SENSE
DECIDE
ACT
PCM
AB
4 THROTTLE POSITION SENSOR
3 IDLE AIR CONTROL MOTOR
1 INJECTOR
4 EVAPORATIVE EMISSION
VENTILATION SOLENOID
2 EVAPORATIVE EMISSION
PURGE SOLENOID
EVAPORATIVE
EMISSION
CANISTER
3 INTAKE AIR TEMPERATURE
SENSOR
5 CAMSHAFT POSITION
SENSOR
1 LEFT BANK HEATED
OXYGEN SENSOR (FRONT)
9 LEFT BANK HEATED
OXYGEN SENSOR (REAR)
CATALYTIC CONVERTER
13 MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
ENGINE
COOLANT
TEMPERATURE
SENSOR
RIGHT BANK
HEATED
OXYGEN
SENSOR
(FRONT)
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
FUEL
PRESSURE
REGULATOR
12 FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
7,
2
VOLUME AIRFLOW SENSOR
(WITH BAROMETRIC
PRESSURE SENSOR)
AIR INLET
FUEL TANK
A
E
M*
M*
EGR
VALVE
FROM
FUEL
PUMP
TO
FUEL
TANK
6 CRANKSHAFT POSITION
SENSOR
NOTE
* : Manifold port
14 FUEL TANK TEMPERATURE
SENSOR
11
10
8
15 FUEL LEVEL SENSOR
VENT
VALVE
5
EGR VACUUM
REGULATOR
SOLENOID
VALVE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TROUBLESHOOTING STRATEGY
M1131150000546
NOTE: If a DTC is erased, its "freeze frame" data will
be also erased and the system readiness test status
will be reset. Store the "freeze frame" data before
erasing the DTC.
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure to have
exhausted most of the possible ways to find an MFI
fault.
1. Gather as much information as possible about the
complaint from the customer.
2. Verify that the condition described by the
customer exists.
3. Check the vehicle for any MFI Diagnostic Trouble
Code (DTC).
4. If you cannot verify the condition and there are no
DTCs, the malfunction is intermittent. For
information on how to cope with intermittent
malfunctions, refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How
to cope with Intermittent Malfunction
5. If you can verify the condition but there are no
DTCs, or the system cannot communicate with
the scan tool, refer to the trouble symptom
classification table.
6. If there is a DTC, record the number of the code,
then erase the code from the memory using the
scan tool.
7. Reconfirm the malfunction symptom and carry out
a test drive with the drive cycle pattern.
8. If DTC is set again, carry out an inspection with
the diagnostic trouble code procedures of that
code.
9. If DTC is not set again, the malfunction is
intermittent. For information on how to cope with
intermittent malfunctions, refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to cope with Intermittent Malfunction
10.After repairs are completed, conduct a road test
duplicating the complaint set conditions to confirm
the malfunction has been connected.
NOTE: If the powertrain control module (PCM) is
replaced, Immobilizer Encrypted Code Registration
should be carried out, Refer to GROUP 54A, Ignition
Switch
−
On-vehicle Service
−
Immobilizer Encrypted
Code Registration
DIAGNOSTIC FUNCTION
M1131155500193
.
MALFUNCTION INDICATOR LAMP (SERVICE ENGINE
SOON OR CHECK ENGINE LAMP)
Among the on-board diagnostic items, a Malfunction Indicator
Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illu-
minates to notify the driver of an emission control malfunction.
However, when an irregular signal returns to normal and the
powertrain control module (PCM) judges that it has returned to
normal, the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) is switched off.
Moreover, when the ignition switch is turned off, the lamp is
switched off. Immediately after the ignition switch is turned on,
the Malfunction Indicator Lamp (SERVICE ENGINE SOON or
Check Engine Lamp) is lit for five seconds to indicate that the
Malfunction Indicator Lamp (SERVICE ENGINE SOON or
Check Engine Lamp) operates normally.
.
SERVICE
ENGINE
SOON
BRAKE
A/T
TEMP
HOLD
ANTI
LOCK
CRUISE
AK000325AC
MALFUNCTION INDICATOR LAMP
(SERVICE ENGINE SOON OR
CHECK ENGINE LAMP)
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